What is girlfriend forgot my birthday?

As an AI language model, I do not have any personal information about you or your girlfriend. However, if your girlfriend forgot your birthday, it can be a disappointing and hurtful experience for you. You may feel that your girlfriend does not care enough about you to remember such an important day. It could also be a sign that your communication with your girlfriend needs improvement. The best way to address this issue is to talk to your girlfriend about how you feel and why it is important to you. Try to approach the situation calmly and constructively, and work together to find a solution.